Qiradkuple-eteedle sewing-machine



APPLICATION FILED DEC.8.1915.

Patented. Aug. 1, 1916.

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A TTORN E 1- A. R. LARSON.

QUADRUPLE NEEDLE SEWING MACHINE.

APPLICATION HLED DEC.8. 1915.

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A. R. LARSON.

QUADRUPLE NEEDLE SEWING MACHINE.

APPLICATION FILED DEC.8. 19x5.

www. Patented Aug. 1; 1916.

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AXEL R. LARSON; F BRIDGEPORT, CONNECTICUT.

QUADRUPLE-NEEDLE SEWING-MACHINE.

mes es.

Application filed December 8, 1915.

To all whom it may concern:

Be it known that I, AXEL R. LARSON, a citizen of the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented an Improvement in Quadruple-Needle Sewing-Machines, of which the following is a specification.

This invention has for its object to provide a quadruple-needle, lock-stitch sewing machine of the rotating hook type, that is the type of machine in which the stitch is made by the employment of a rotating hook to pass the loop of needle thread about a bobbin lying within the hook; this result I accomplish by the use of two hooks rotating in the horizontal plane, and two hooks rotating in the vertical plane and lying between the first mentioned hooks.

With this object in view, the invention consists in certain constructions and in certain parts, improvements and combinations which will be hereinafter described and then specifically pointed out in the claims hereunto appended.

Tn the accompanying drawings forming a part of this specification, Figure 1 is a view partly in elevation and partly in section of the portion of the stitch-forming mechanism of a sewing machine which lies below the bed plate, and the driving mechanism therefor; Fig. 2 an inverted plan view corre sponding with Fig. 1; Fig. 3 an end elevation as seen from the left in Fig. 1; Fig. 4 a section on the line indicated by 4 in Fig. 1, looking in the direction of the arrows, and Fig. 5 is a detail view of a holder for retaining bobbin cases against rotation.

denotes the needles which are in alinement and are carried by a vertically reciproeating shaft 11, 12 the bed plate, and 13 a shaft for driving the rotating hooks, which is journaled in bearings 14 depending from the bed plate.

15 denotes the needle'plate, which is pro vided with four holes. 16 suitably located for the needles to pass through. Below the plane of the needle plate and suitably located to engage the loops of thread formed by the outer needles, are rotating hooks l7 and 18 lying in the horizontal plane and be- Specification of Letters Patent.

Patented Aug. 1, 1916.. Serial No. 65,681. i

' tween them are two rotating hooks 19 and 20 lying in the vertical plane, which are suitably located to engage the loops of thread formed by the inner needles. Horizontal hook 17 is carried by a vertical shaft 21 journaled in a bearing block 22 adjustably secured to the bed plate, see Fig. 2. This shaft also carries a bevel pinion 23 which meshes with a bevel gear 24 on shaft 13. Vertical hook 19 is carried by a short horizontal shaft 25 journaled in a bearing 26 which is secured to bearing block 22. This shaft also carries a pinion 27 which meshes with a gear 28 on shaft 13. Horizontal hook 18 is carried by a vertical shaft 29, and vertical hook 20 is carried by a short horizontal shaft 30. Shaft 29 is journaled in a sliding bearing block 31 and shaft is journaled in a bearing 32 which is secured to the sliding bearing block. Shaft 30 carries a pinion 33 which meshes with a gear 34, and shaft 29 carries a bevel pinion 35 which meshes with a bevel gear 36.

61 denotes guards secured respectively to bearings 26 and 32 which cover the upper portions of pinions 27 and 33.

Gear 34 and bevel gear 36 are carried by a sleeve 37 which is secured to shaft 13 by means of a spline 38, said sleeve and gears being driven by the shaft but having longitudinal movement thereon. Bearing 32 is provided with an opening 39, see Fig. 2, through which shaft 29 passes freely, and

v sleeve 37 is provided with a circumferential groove 40 which is engaged by the lower end of said shaft, so that movement of the slide in either direction will also carry the sleeve and gears on shaft 13. The sliding bearing block is provided with an elongated opening 41 through which one of the bearings 14 for shaft 13 passes freely. The sliding bearing block is locked with the parts carried thereby in operative position, by means of a spring latch 43 carried by a holder 44 secured to the bearing block and engaging a suitable keeper 45.

As the special construction of the rotating hooks is not of the essence of the invention, I have not' illustrated them in detail and do not consider it necessary for the purposes of this specification to describe the operation of forming astitch. It is sufficient to say that any ordinary or preferred style of rotating hook may be used and is within the scope of the present invention.

l6 denotes the feed bar which operates as usual.

47 denotes the bobbin case corresponding with horizontal hook 17, which is provided with a lug 48 engaging depending lugs 49 1 (one only being shown) on the needle plate,

secured to the inner end of the sliding bearing block and comprises a forwardly extending bar 56 which has dovetail engagement with the needle plate (see Figs. 1, 4: andv 5) and is provided at its forward end 'with depending lugs 57 which are engaged by a lug 58 on bobbin case 54. At the rear end of bar 56 is a notch 59 which is engaged by a lug 6O extendingfrom bobbin case 53. It will be noted,.see Fig. 1, that bar 56 fits I closely in the needle plate and is provided with needle holes in alinement with two of the needle holes in the needle plate.

Access to horizontal hook 17, in order to change bobbins or for any purpose whatever, is obtained by withdrawing a slide 62 in the bed plate, and access to horizontal hook 18 is obtained by withdrawing a slide 63 in the bed plate. In order to obtain access to the vertical hooks, in addition to ,withdrawing slide 68 the operator disen gages latch 43 from its keeper and slides bearing block 31 and the parts carried thereby, including horizontal hook 1S and vertical'hook 20, toward the left from the position shown in Fig. 1, which leaves both vertical hooks perfectly easy of access. It should be understood that the terms horizontal and vertical as appliedto the planes in which the hooks rotate are relative only. It is of course not essential that hooks 17 and 18 rotate in a plane exactly horizontal to the needle plate or that hooks 19 and 20 rotate in. a plane exactly vertical thereto. 'The terms vertical and horizontal have been adopted for convenience in description.

Having thus described my invention, I

claim 7 '1. In a machine of the character described, in combination, four alined needles, two hooks rotating in the horizontal plane, two hooks rotating in the vertical plane and lying between the horizontal hooks and a sliding bearing block by which one horizontal and one vertical hook are carried.

2. In combination, a horizontally rotating hook of the character described, a vertically rotating hook contiguous thereto, a second 70 vertically rotating hook contiguous to the first, a horizontally rotating hook contiguous to the second vertically rotating hook and opposite to the first horizontally rotating hook, and means for moving the last mentioned horizontally and vertically rotating hooks out of operative position, to permit access to both vertically rotating hooks.

3. In a machine of the character described, in combination, two vertical and two horizontal hook-carrying shafts, bevel'pinions on the vertical shafts, pinions on the horizontal shafts, a driving shaft, bevel gears thereon engaging the bevel pinions, gears thereon engaging thepinions, a sliding bearing block by which one vertical and one horizontal shaft are carried, and a 1011- gitudinally movable sleeve, splined on the driving shaft, by which one gear and one bevel gear are carried, said sleeve having a circumferential groove which is engaged by the corresponding vertical shaft, for the purpose specified.

a. In a machine of the character described, in combination, two horizontal and two vertical hook-carrying shafts, a driving shaft and co-acting driving elements on said shafts, a sliding bearing block in which one horizontal and one vertical shaft are journaled, two of the driving elements on the driving shaft being splined thereto and moving longitudinally with the bearing block, and means for retaining said block and the parts carried thereby in operative position.

5. In machine of the character described, in combination, four needles, two hooks rotating in the horizontal plane and two hooks rotating in the vertical plane and lying between said first mentioned hooks.

6. In a machine of the character described, in combination, four vertically movable needles, a hook rotating in the horizontal plane and a hook rotating in the vertical plane cooperating respectively with two contiguous needles, a hook rotating in the vertical plane and a hook rotating in the horizontal plane cooperating with the other two needles, and means for moving the two last mentioned hooks out of operative position simultaneously.

7 In a machine of the character described, in combination, two vertical and two horizontal hook-carrying shafts, a driving shaft, driving connections between the driving shaft and the other shafts, a sliding bearing block by which one vertical and one horizontal shaft are carried, and a sliding horizontal shaft are carried, and a sliding sleeve keyed to the driving shaft by which sleeve keyed to the driving shaft by which the driving connections corresponding with the driving connections corresponding with the shafts on the sliding block are carried. the shafts on the sliding block are carried,

5 8. In a machine of the character desaid sleeve being provided with a circumfer- 15 scribed, in combination, two vertical and ential groove which is engaged by the cortwo horizontal hook-carrying shafts, a drivresponding vertical shaft. ing shaft, driving connections between the In testimony whereof I aflix my signature. driving shaft and the other shafts, a sliding 10 bearing block by which one vertical and one AXEL R. LARSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. U. 

